Low audio to echolink from dmr

very low audio to echolink from dmr audio as volume level

How can be increased?

If there any DVSwitch users on here maybe one of them will chime in and help you. If not you could try DVSwitch.groups.io

You should join the dvs group at https://dvswitch.groups.io/g/main/topics

But there is a method to adjust the volume levels from the usrp of analog_bridge.ini
[USRP]
server = 127.0.0.1 ; IP address of Allstar/Asterisk
toASLPort = 32001 ; Analog_Bridge <-- ASL
fromASLPort = 34001 ; Analog_Bridge --> ASL
aslAudio = AUDIO_UNITY ; Audio to ASL (AUDIO_UNITY, AUDIO_USE_AGC, AUDIO_USE_GAIN)
agcGain = -20 ; Gain (in db) of the AGC filter
dmrAudio = AUDIO_UNITY ; Audio from ASL (AUDIO_UNITY, AUDIO_USE_GAIN, AUDIO_BPF)
dmrGain = 0.35 ; Gain factor of audio from ASL (0.0-1.0)

See documentation at groups.io
Just a note, before you start adjusting things, be sure that you have your allstar audio adjusted to spec before you start or you may find yourself piling on to a bigger situation.

On the allstar side for echolink only…
you have these 2 adjustments that must be included in rpt.conf of the allstar node the echolink attachment is made.

erxgain=2 ; Echolink rx gain adjustment
etxgain=2 ; Echolink tx gain adj Note: Gain is in db-volts (20logVI/VO)

I would make adjustments from the digital side first. A ajustment here affects all as/el connections on your server.l

There is no direct correlation between dmr and echolink so one could assume that the dmr audio is low.
And that could be from a number of reasons you should look at carefully and verify.